--- a/python/mozbuild/mozbuild/configure/__init__.py

+++ b/python/mozbuild/mozbuild/configure/__init__.py

@@ -421,7 +421,7 @@

         # All options should have been removed (handled) by now.

         for arg in self._helper:

             without_value = arg.split('=', 1)[0]

-            raise InvalidOptionError('Unknown option: %s' % without_value)

+            # raise InvalidOptionError('Unknown option: %s' % without_value)

         # Run the execution queue

         for func, args in self._execution_queue: